as others have indicated, i would guess you have pH problems.... the bottle water i been buying lately has a pH of 8.8 !!! fork over the money for a digital pH meter.
also, like a few others have indicated, it looks like your plant went into flower mode... when it goes back into veg mode it, like, "resets" and goes back through the leaf production schedule of 1 leaf, then 3 leafs, then 5 leafs, like it was a baby.