Coin separators (counters) have a few adjustments that can be made so almost any size coin can be counted. If the machine is set too tightly it can exclude or jam on bent or brand new coins that are a little out of spec and if set to loosely they'll pass different sized coins. It's common for slightly smaller coins to be included with larger coins if it's too sloppy. I suspect this is what's happening here.
Time don't fly, it bounds and leaps.