There is a 1943 report on the Tiger, written by British analysts, which probably serves as a reference for model companies designing Tiger kit interiors. But the report contains some errors, one of them substantial.
All of the ammunition rounds in the Tiger's sponsons faced forward except for those in the rear right-hand ammunition bin. But this British diagram of the ammunition storage doesn't match the tank. It shows the rear left-hand bin (marked X) with its rounds facing backwards, which is wrong. All of the surviving Tigers and all available wartime photos agree on this.
The rear left-hand bin had its rounds pointing forwards. This is an extract from a photo of Tiger "131", at the beginning of its 1990s restoration, and we can see that ammunition bin. The forward ends of the rounds align to the solid panel and the supports that are close together (arrowed).
Model Factory Hiro made the same mistake as the draftsman in 1943. They put this block of ammunition (arrowed here) facing the wrong way. This is a CAD image of the kit, released by MFH.
You can fix this mistake in your kit by simply reversing that block of ammunition. But the door of that bin should also be reversed, and that is not easy because it is a PE part. The solid panel marked here, should be at the right side rather than the left. Compare to the photo of Tiger 131.