Some of these intersections can be tricky and some you may not be able to fix correctly but have you tried changing the reference edge to the opposite side for one to two of the walls or perhaps all off them to the centre position?
"The simplification of anything is always sensational" GKC
AC 25-4013 USA, CadImage Tools
2019 MacBook Pro 16" w/ AMD Radeon Pro 5600M GPU
OS X 11.6
2.4 Ghz 8 core i9, 64 GB RAM
27" LG 5K Monitor