A loop counts as one macro run with regard to the XClick limit. So if your macro has 6 XClick, you will reach the 25 limit in the 5th run.
Solution (for free version): Use the command line API to make loops. This restarts Kantu for each loop => endless loops with XClick 
Even easier: Upgrade to the Personal Edition if you can afford it.
For more info, see the discussion here: Limit of 25 XClick / XType / XMove commands for free Users of Kantu - #9 by JYamamoto