Visual Error on Block or Area?

SwiftChuck

L1: Registered
Jun 30, 2023
9
1
Hello, I am currently trying to make a balcony for a map and whenever I make the part on which you stand it bugs out visually making it see-through (Shown in the image below.) I have tried func_detail, retexturing it, brushing it, reopening hammer, alt-p, and rebuilding it and I am lost for an answer, Also I have made copies of the block and moved it over, and it is completely fine. please if possible tell me what may be the solution thank you.
20230704210457_1.jpg