partial tongue flicking...

I just got a shipment of snakes yeaterday and put them in the quarantine rack in my house. They all seem alert and there is no sighn on discharge from nose etc. I left them in the rack overnight and today just took them out briefly to check over. It seems that two of the snakes have partial tongue flicking, i.e. the tongue just comes out half way on one of them, and the other one only the tip coming out. They seem otherwise normal. The others are all normal in tongue flicking.

I am currently giving those two a soak in warm water with electrolytes as recommended by a snake keeping friend who experienced this before.

Does anyone know what this is caused by and what to do and expect?

UPDATE: Of those two snakes, after the soak in electrolytes, one of them is now flicking normally again.

The other one is still only showing the very tip of the tongue (the forked part is 70% out when flicking, thats it.) It may be of note that this snake arrived in the shipment in shed.

Anyone can help?

It's one of those things I would keep and eye on rather than rushing to any form of treatment aside from getting husbandry right.