As described here: https://forum-en.gw2archive.eu/forum/professions/guardian/Bug-Symbol-of-Punishment-Scepter
The symbol of punishment, unlike other symbols pulses the boon 4 times (base) instead of 5 like other symbols. All symbols, but the Symbol of Punishment, pulses when it is placed and one second later for the duration of the symbol. The Symbol of Punishment doesn’t pulse the boon (might) when is placed.
Sorry for my english.