GCM Yatırım's Inconsistent Swap Costs and Suspicious Pricing

In my Forex trades, I've noticed that different swap costs are applied every day, and the cost can vary even within a single day. It's perplexing how the swap cost can be normal on Tuesday and suddenly double or even more on Wednesday. As shown in the images, Adobe's total swap cost was $6 yesterday, but this morning it jumped to $12 out of nowhere. Similarly, the overnight cost for my Nvidia positions was $5, but they claim that if I increase my investment amount, there won't be any cost. When I question why I'm charged for the daily cost, they simply say it's not our doing. It makes me wonder. If you don't charge it willingly when the investment amount is high, how come you charge it when it's low? While Nasdaq index appears around the 13,000 range everywhere else, why does it show as 15,000 in your system? It seems like your systems are integrated with certain factors. The profits go up to a certain point, but suddenly turn into losses and drop all the way down to the figures on the document.