If you're trying to compare the dividend payouts between IG and Capital Spreads, just remember that the timing of those payments might differ, which is why it can appear you have differences, even when you don't.
For example for IG, DFBs will be made "at the close of the underlying cash market". Whereas for Capital Spreads, they make "a dividend adjustment to clients' accounts the day on which or before the index constituents’ trade ex-dividend".
If you're comparing spread betting companies, I'd strongly recommended visiting Spread Betting Company comparison, as they've got info on what features are useful to compare, as well as the actual comparisons
You wouldn't be connected with this site, by any chance? Either way, it's far from comprehensive and therefore a bit misleading.