To add on to what Mick has said, by default, only the Global Moderators group has moderation powers, while being an Administrator only gives you access to Administrator functions in the ACP. That is why you are placed in both groups by default when you are the founder of a board you created. The easiest way to give yourself moderator powers back is to put yourself back in that group. Being a Administrator doesn't inherently make you a Moderator just like vice versa.
ACP > Users & Groups > Manage Groups > Global Moderators > Members > Add Users > Type your username (in this case it is "admin") in the box and press submit.
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