Open one of your source video clips in the free download MediaInfo. In MediaInfo, set View to Text and then copy the report that it generates and paste it to this forum. Once we know what the video is composed of we'll better be able to help you.

I'm suspecting your problem is related to your video having AC3/Dolby Digital audio and your editing it on Windows 7.

OK

Here is audio file

General
Complete name : C:\Users\winterlight\Videos\Wicked Israel\Wicked-Israel-single-version with countdown_1.mp3
Format : MPEG Audio
File size : 6.89 MiB
Duration : 5 min 1 s
Overall bit rate mode : Constant
Overall bit rate : 192 kb/s
Genre : Other
Audio
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 3
Format settings : Joint stereo
Duration : 5 min 1 s
Bit rate mode : Constant
Bit rate : 192 kb/s
Channel(s) : 2 channels
Sampling rate : 44.1 kHz
Frame rate : 38.281 FPS (1152 SPF)
Compression mode : Lossy
Stream size : 6.89 MiB (100%)

Here is video file

General
Complete name : C:\Users\winterlight\Videos\Wicked Israel\greenscreen shots\dev horns cam 1.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42 (isom/mp42)
File size : 634 MiB
Duration : 5 min 8 s
Overall bit rate : 17.3 Mb/s
Encoded date : UTC 2019-10-19 01:45:30
Tagged date : UTC 2019-10-19 01:45:30
com.android.version : 7.0
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4
Format settings : CABAC / 1 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 1 frame
Format settings, GOP : M=1, N=30
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 5 min 8 s
Source duration : 5 min 8 s
Bit rate : 17.0 Mb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 30.000 FPS
Minimum frame rate : 26.906 FPS
Maximum frame rate : 31.002 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.273
Stream size : 625 MiB (98%)
Source stream size : 625 MiB (98%)
Title : VideoHandle
Language : English
Encoded date : UTC 2019-10-19 01:45:30
Tagged date : UTC 2019-10-19 01:45:30
mdhd_Duration : 308275
Codec configuration box : avcC
Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 5 min 8 s
Bit rate mode : Constant
Bit rate : 256 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 9.41 MiB (1%)
Title : SoundHandle
Language : English
Encoded date : UTC 2019-10-19 01:45:30
Tagged date : UTC 2019-10-19 01:45:30

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Phillvictor lamonde, I don't see anything unusual about the file specs, and the problems you're describing are not typical.

Can you upload both clips to OneDrive, DropBox or Google Drive and paste the link here so others can test them? It would also help to see the DxDiag results as described in the link PDM provided as there may be a simple coinfiguration issue on your PC.

YouTube/optodata

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I just had the exact same problem. Very irritating.
But it seems there is a simple solution.

Right click on the sound track and click 'Use automatic beat detection.'
This will bring up a new window which initially will be blank and might say something like 'analyzing waveform for display.' If it's a long track, you'll have to wait a few minutes, but eventually a waveform will appear.
Click 'apply' and it should appear on your timeline soundtrack.
Not sure if it makes sense but it seems to solve the problem. Perhaps a Cyberlinke person can chime in. (Hint: there's a tip jar on my desk)