Is it just me or placing Feds on friends towns are getting harder and harder to do?

Yup, it is a glitch.

I had the "town is full of Feds" message on my B town, but when I checked it, there were no Feds to be found. I tried going to Krustyland, visiting neighbors and restarting the game with no luck. About 12 hours later, they did show up but there were only 5 or 6. The next morning, all was back to normal and I haven't had any Fed glitches since then.