We have a bunch of BaR with different areas on the base and partly different settings (i have some as air defense which are above the base and only set to grind.

It was great in the beginning but at the moment it seem the BaR start grinding down stuff when the connection to the base does not exist or is outside of their area and multiple BaR cover the block.
It seem to be related to projected stuff, my ships and base have a projector with keep projection active.

It happens with all three modes weld before grind, grind before weld and grind if weld is stuck.

it does not happen when only one BaR is turned on

Additional info: The base changed ownership twice, once from me to my teammate and later back again.