Why does the LG Standard Split air conditioner gurgle when turned off?

Hello, yesterday I celebrated my birthday, there were a lot of people, the radiators were turned off and it was still hot, I decided to turn on the air conditioning (Lg Standard Split), it cooled for about 2 hours, then I turned it off. This morning I enter the room and I can hear some gurgling noise from the indoor unit. The condensate is drained by gravity outside to the balcony through a flexible pipe into a 10-liter tank. In the summer, such things didn`t happen, I disconnected the power supply, it bubbles, I poured out the accumulated condensate, it still bubbles from time to time, I took off the entire casing of the indoor unit, unscrewed the drip tray, wiped the remaining water, blew into the outside tube a few times, and some of the residual water squirted out through the I wiped the internal unit, put everything back together and it didn`t leak even once throughout the day. Why is this happening? There was no such thing in the summer, I have had the click-conditioning installed since August 2019.

In my case, the drilling was done by the company that installed the air conditioning and they drilled diagonally downwards, so it`s OK, I`ll pour water over the condensate system in the spring, now it`s leaking so much that I just don`t want to play with it, go out to the balcony to the condensate tank and generally the leftovers in the pipe at night. they could freeze. And a different question: why, for example, if I turn on the heating function and set 25 degrees, the air conditioning does not even reach that much (I check the actual temperature on the remote control) and every now and then it goes into the drying/defrosting mode and after a while it heats up again and so on, and so on. the external unit, its radiator is not frozen to the touch so that it has to defrost every now and then

I noticed the following relationship in the LG Standard 3.5 kW: if we turn on the heating, e.g. today - 2 degrees and immediately turn on the quiet operation mode of the unit, the air conditioning will defrost on average every 15 minutes, but if we turn off this function and even if If we turn it on during operation, the device will continue to heat... I checked defrosting twice every 15 minutes, I turned off the silent operation function, it runs continuously for 1 hour, I turned it on, it runs continuously, it`s been 2 hours without defrosting.