Where are you located and how many crops does your Sweetheart produce?
I picked one up this spring and it successfully double cropped for me in Zone 8B PNW. A very early crop and very late crop. But it also started to triple crop in late September and the berries were not as sweet but it was a nice treat to have in late October. However during November it started exhibiting “everbearing” tendencies and was forming new self fertile flowers and forming a small handful of new berries every week. The weather is too cold for those to not be tart but they sized right up.
This morning I pulled off all the berries and there were 4 more flowers that had opened up on it as well that I pulled.
Anyway, just curious if yours behaved the same and where you are located.