Mem bug?

[Vazzgo]

I don't know if this it's supposed to happen, see for yourself on the difference of memtimes..

<> mem
You have memorized the following spells:
( 3rd circle) 1 - minute meteors
( 2nd circle) 6 - shocking grasp
( 1st circle) 6 - magic missile

And you are currently memorizing the following spells:
1 seconds: ( 3rd) minute meteors
14 seconds: ( 1st) magic missile

You can memorize no more spells.

<>
You have finished memorizing minute meteors.
< 59h/59H 164p/164P 65v/120V >
<> mem
You have memorized the following spells:
( 3rd circle) 2 - minute meteors
( 2nd circle) 6 - shocking grasp
( 1st circle) 6 - magic missile

And you are currently memorizing the following spells:
15 seconds: ( 1st) magic missile

You can memorize no more spells.

After i finish meming minute meteor and next spell (magic missile) supposed to be memed on 13 secs but it goes up to 15 sec.