A few weeks ago I lost about 400 HWpts in one shot. As it's unlikely someone beat that many scores in one go and I heard other people complain about this) I strongly suspect this is the dreaded hwpts rankings bug (more details here). It as been ongoing for months and hwbot is famously short on developers, would reallowing accountwide recalculate until this has been fixed by a reasonable workaround?
Currently it's disabled:
In the absence of a code fix I see this as the only reasonable solution as looking through 1,100+ submissions is not an option...