are your source clips from a smart phone or a screen recording? if so, the problem is more than likely cause they're variable frame rate.
my source clips from a screen recording, and nope it's not related screen recording frame rate.
As seen in the records this is an error issue in the interface of the software.
I'm using the same version on a different computer and there is no such problem, I'm just trying to figure out which hardware the problem might be related to.
I deleted and reinstalled premiere.
I also tried resetting the interface.
this weird issue didn't happened with other adobe software other than premiere
cpu:ryzen 5 3600
gpu: asus rog gtx 1080
nvidia studio drivers latest version
Most likely, this has to do with your gpu. I'm not sure this would help, but try re-installing the studio drivers.