In Copenhagen, there are many of these parking racks (as shown in the picture), usually people (like me) will just slip the front wheel in and lock the bike. After using them for a while, I happen to notice the front wheel of my bike appears to be slightly bent. I have not crash the bike before and didn't make any modification to it.
Is that using this kind of parking rack to park my bike will cause damage to the wheel? If using these parking rack could harm the bike is there any alternative/safe way to use them?