Scaling Mana/5sec Seals and Glyphs [CLIENT/GAMEPLAY]

The math on the scaling mana/5sec runes seems to be incorrect. It is showing that the glyph (which gives 0.005 less mana/5sec than the seal per level), gives more MP5 at level 18. See screen shots below.

Seal: 0.065 mana regen / 5 sec per level --> 1.17 Mana regen / 5sec @ Level 18 Glyph: 0.06 mana regen / 5 sec per level --> 1.20 (0.06 * 18 = 1.08) Mana regen / 5sec @ Level 18 IT SHOULD BE 1.08

I should add... these runes have been this way for at least a year.. I assumed RIOT knew.. >.<

http://imgur.com/a/Dl7N6