This account received a 600-Algo payment at block 112759, which was the last transaction in it according to the explorer. But now it has only 100 Algos which seems impossible.
Is this a bug or am I missing something?
Probably just a problem with the explorer.
Thats what we think as well. The folks who made the explorer (RandLabs) are looking in to it!
It is fixed the issue in algoexplorer.io
Please, report any issue through our twitter account @algo_explorer