I had the se situation before deleting the data and restoring the whole wallet. No amount of reseting the graph or chosing low ping peers fixed that. And yes, the nubmer of channels was incorrect.
After  deleting and restoring the wallet yhe zombie channels get cleaned up and are usually below 100.
I am quite sure that this is  some kind of a bug in the wallet.

BallLightning

Yes that number is normal. The message I think is wrong. Instead of indicating the zombies number it should indicate that the online nodes number is wrong.

The zombie number do not affect your path finding, but the wrong number of online nodes yes.

That message is because your node is not syncing well with neutrino peers, so the EGS it also hang. So the app is alerting you that you should check your connection.

lightning

Zeus bimodal pathfinding doesn't work

Yes that number is normal. The message I think is wrong. Instead of indicating the zombies number it should indicate that the online nodes number is wrong.

The zombie number do not affect your path finding, but the wrong number of online nodes yes.

That message is because your node is not syncing well with neutrino peers, so the EGS it also hang. So the app is alerting you that you should check your connection.