[Glass] Duplicate classes in `browse class MyClass` results?

[PAUL DEBRUICKER]

Hi - 

This is after a 

GsDeployer cleanClassHistory

in a 3.3.1 stone, on Ubuntu 18.04.


Its the first time I've seen it but the search result pane shows

MyClass
	MySubClassA
	MySubClassB
MyClass {1848835841}
	MySubClassC
	MySubClassD

All the subclasses should be subclasses of MyClass


How did I get here and how do I fix it?  

Thanks