Motion Tile gaps

Basically, I'm trying to add a skew transition to one of the clips in my edit for Tiktok. The whole composition already has motion tile and wiggle position added onto the adjustment layer to create a panning/shake effect. The tutorial video i'm following says i need to add motion tile onto the individual clip too in order to acheive the skew transition but every time i do, these black lines appear around the edges of the clip, and no amount of adjustments to the position or scale gets rid of them. I was thinking it was because i already have motion tile added to the adjustment layer but i have this issue quite frequently when using AE. For example, I'd finish the whole edit and add the adjustment layer last for the shake effect, and the black bars appear again despite no motion tile being used anywhere else.  I would very much appreciate any help on this issue. Thanks