Assuming you're running a 1:3 ratio site a 3x nuke does take 5x creds. For example 2.5mb on a 1:3 site:
1x = 1 x size x ratio
Or in other words, 1x = 1 x 2.5 x 3 = 7.5mb (thats all the credits they earned for uploading, so all's square).
Anything addition after that is:
Multiplier -1 x size
Or 3 - 1 x 2.5 = 5mb
So all up, 7.5mb + 5mb = 12.5mb (or 12.49 whn precision has come into effect
.
Thats the way nuking works, not a bug.
As for it posting as 1x in chan, thats a sitebot issue not ioA.
12-14-2004 11:19:57 NUKE - Nuketag: g:\dump\[Nuked]-sumstuff\[NUKED]-[3x]-[by siteopNICK@SiTEOP]-[test.test]
That line show ioA is logging it perfectly, just for some reason your bot is misreading it. If using ioBanana make sure you change the output format as advised in the set-up.