Hi everybody!

I've had this plant for some time now. While it was quarantined, it suffered a thrips attack. Really small scale, though. There were only a few larvae. A little bit of neem oil and in one week the plant was free again. Now new flowers have grown and I'm noticing something... The flowers are a little smaller than before, some have only four petals instead of five, some even have six petals. Some have underdeveloped stamen. There are no pests roaming the plant. The leaves look perfect, single deep green, no stripes on the red backing, no spots, the plant is growing. Could this be a nutrition problem?

The plant when I got it:

The flowers now: