This usually happens when a person is inexperienced and is not able to correctly anticipate their landing spot, causing them to fall off the trampoline or land at an unsafe spot. However, this can even happen with the experts; this is why it is always recommended to have safety nets attached with the trampolines.
Trampolines that come with safety enclosures come in various styles and sizes. It is always recommended to get a trampoline with an enclosure if you are a first time user especially. Every trampoline size has a corresponding enclosure that can fit it. This fit is especially important to ensure the enclosure is safe and properly connected to the trampoline. This is why it is important to check enclosure compatibility while buying them for your trampolines.