Additional mercenary can't join multistage - grayed / disabled checkbox

[pekarna]

Hi,

in a multistage dungeon, when I choose to be accompanied only by some Mercs, I can't add the others afterwards - the checkboxes next to mercs that I did not use for the first time are disabled.

Is that intended? It's quite annoying, since I can call them to join the fight after I fought alone, but I can't fight in two and then call third one to help?

Thanks for clarification.

[Crassus]

Well it's normal... Since you call one or more of your merc the other stay behind and they are unable to follow you...
Since you know how it works now you will be able to plan your merc use and potion supply more efficiency.