I already did contact them. And even made one as user. It was said that it is browser cache bla bla. It can't be because the same errors exist in the Android version and on two different browsers on two different computers. If these guys couldn't help I don't know who can. Furthermore the duplicate expenses show in the totals but the already paid invoices do not. Can you imagine me doing a VAT return now? No. It sounds like financial crime.