Steel Legion Lux purchasing incorrectly

Long story short, I began with 2810 RP. I purchased SL Lux for 975 RP. My remaining RP came to 860, which meant that SL Lux actually cost 1950 RP, despite what the skin itself says. When I refunded the skin, I ended up with 2810 RP again (thankfully). There is obviously an issue here.