Yep; most definitely a bug. Even when fully patched with Trials of the Luremaster, you will still get it. It is somewhat rare. It probably is based on one of the following:
1. Memory Leak (when you have been playing a long time--it's good to save and reboot the 'puter).
2. Operating System and patch levels.
3. Video card and patch levels--as well as a number of associated things such as settings and version of DirectX.
4. Amount of system memory and virtual memory settings.
Etc.
If you want absolute proof, just use the spell: Contact Other Plane. The Spirits add up but your summon count doesn't go away when they do!
Bottom line: you can summon any six (6), but the bug might rear its ugly head.
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