Finite element connections for curtains with different heights cannot be established properly. This problem is solved if the finite element size is determined by a number dividing the heights of both screens into equal parts. or do not enter those basement curtains at all. If you do not want the stirrup compaction zone to remain within the sub-basement curtain, select complete compaction. or manually increase the height of the lower compaction zone. I couldn't examine it fully in your model, but there seems to be a modeling problem. because those two curtains are subject to a lot of cutting. I think figuring out the cause of this might do the trick.