The thing is; wheels are drilled for spokes to be used with a certain hub size.
Your rear wheel prolly was drilled to fit a smaller diameter (disk brake) hub.
This is a common problem with generic rims. Some sellers will mention drilled for a disk brake OR a drum brake hub that usually gets the holes pretty close.
I've made the wrong type rim work but it's a bit of a kludge.
A company like Buchanans has a set up to drill rims CORRECTLY for
your specified hub diameter AND width, both matter, not just some generic size hub.
This rear has slightly bent spokes from misaligned spoke holes in the rim but has been in service for well over 10K miles with no issues.
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PS I don't see an issue with your spoke pattern.