Sliding Tile Puzzle TExture

Hi, I am making a Sliding Tile Puzzle on our game but I’m having problems with the texture (as you can see below). It seems to shrink, and I don’t know how to fix it.
I followed a tutorial on YT but he didn’t specify on how to fix this issue (he said to use the standard cube but it didn’t work).
Here is the video: UE4 Slide Puzzle Pt1…Spawn Shuffle Scale (UE4 Tutorial)

I hope you can all help me and Thank you in advance!

Can you show the texture, is it square?

Hi, I’m trying follow the same video for my sliding puzzle and have encountered the same issue along with a problem in GetNeighbours. Have you managed to solve the issue and have a working sliding puzzle? If yes, can I please have some guidance or pictures of your blueprint? Any help or advice would be appreciated! Thank you