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'sticky' polygroups problem when intersecting?

Sorry if I say this unclear, English is my second language here. I cannot even describe this problem I am having clearly, so I could not find a good terms to search, sorry if it has been asked before.
I will attach a gif to show what is happening, can anyone tell me why this happens to one polygroup of objects but not another? All were created with the same Mesh Insert brush.

ezgif-2-c29a928aec82

Hi @pherocactus

This confused me at first, but is probably just the result of using the Transpose tool to move two meshes that are too close together apart while X symmetry is active. Transpose operations can produce odd results when scaling or moving along axes for which symmetry is also active. It basically creates two opposing versions of the transpose operation, and sometimes these operations can overlap in unexpected ways.

You’ll notice that you can move them together without issue, but once you start to move them apart again, the meshes are now too close to produce good results with symmetry. If you did not move the mesh together first, you could probably move them apart without issue.

You can also disable symmetry, move only one mesh, then use Tool > Geometry > Modify Topology > Mirror and Weld to mirror the boot to the other side. This only works in one direction, so you may need to move one boot and not the other to get it to mirror correctly.

Thank you - I found a solution in the meanwhile. For some reason, if I do split them to a new sub tool and then merge them back to the rest of the model, the problem goes away. Maybe some one else will find that helpful.