Exporting when shouldn't be

Ive had my solar install working for about 4 years with no issues, one of the things i installed was a solic solar divertor mainly because I didn't want to give anything back to the grid for free and they wouldn't pay me for it as it was a self install so didn't have the paperwork needed. Diverter lights up as should an when it was all lit up green (producing more power than using) we had power going to Emerson heater in the hot water tank. The button in the solus to switch on the immersion also worked on install. Skip forward to now and I've had a new fancy meter fitted (upgraded to 3 phase) that shows export as well as usage, went to look at the reading after it's been installed a week and I've used 40kw but Exported 10kw an it's not even been sunny this last week...... The solus still all appears to be working, there's no way it's ever heated my hot water tank up to full temp so why am I exporting? Really hope I've not been giving away leccy for the last 4 years. Our install is only about 3kw so say we only have 500watt "spare" is that not going to have enough ooooomph to get into a 2kw heater or would it still draw it in? Or is there any other reason it's still exporting?

I new when I installed the diverter it would have very little effect on the hot water but wanted to use all my own power up!

Edited just now1 min by Barryscotland