To reproduce, just insert a Frame and add a UIStroke to it and you’ll see a gap at the bottom. This may be a bug caused by 2560x1440 resolution.
CPU: Intel(R) Core™ i7-8700K CPU @ 3.70GHz
GPU: NVIDIA GeForce RTX 2080
I expect there not to be a gap between the Frame and the stroke outline.
There is a gap between the Frame and the stroke outline
You can workaround it by adding a 1 pixel frame to fill the gap but obviously this is not ideal.
Issue Area: Engine
Issue Type: Display