This looks like the begin of Nitrogen excess.
Nitrogen toxicity symptoms are:
1-Old leaves are dark green with tips bended down
2-New leaveas are light green and deformed.
You should consider to reduce N during fertilizations, especially in flowering stages, nitrogen exceedings may lead to a longer flowering stage and bad taste buds.
Suggestion to resolve your issue: give only water for a couple times, than start back using flowering fertilizers only, drastically reducing nitrogen.
If you are doing good, you should see old leaves starting chlorosis halfway through the flowering phase.