So, basically, liquidations just close my trades at bad prices, and then charge me for it.

Not quite. In fact, in almost all instances, liquidations are only partial. The liquidation module will try to close as little exposure as possible, at the least discount possible. Essentially, it tries to bring your LMR down, but just enough to get your margin balance back just below 100%. It accomplishes this by closing only one portion of exposure at a time.

This explains why you might see a series of liquidations in your transaction history: each one closed part of your exposure to bring your account back over water, until markets moved in your favor again, or you are left with no exposure.