Guild Auto Kicks alts or something else?

I did have several toons on TBC, and I have a guild only for purpose of storage, and the guild consist of 3 of my alts, however, I use only one of the alts to make it a second main, a fire mage, the other two alts are like lvl 2-3ish and have been offline for about 6 months since I use my second main the most.
After the Gold cut, I realized those 2 other alts were removed from guild, wondering if that was the result of the Gold Cut/maintenance or something.

When I have time I was gonna re-invite them back, but wondering if this was something that occasionally happens to bank alts on TBC or is this just due to either the gold cut or some system put in the TBC xpac.