it is below grown level
have you checked the level of water in the bowl?if it is not up to maximum level the toilet will not flush properly to check that , fill the bowl slowly with water using a bucket or some other container until the level stops rising then mark this level with a pencil . then flush the toilet and let it refill if the level in the bowl is not up to the pencil mark you need to adjust the fill tube flow . there are two screws on top of the valve one for the tank level and the other for the bowl level good luck
You've been drinking more? Seriously, probably a sensor, but could also be a small run in the toilet.
your dads
Sure ... might require some special pumps and plumbing, but it could be done.
Gravity
on average of average people it would be 4.5 flushes per day (poor toilet)
My g/f has this happen to her regularly and, it was only when I asked that she said she usually flushes once to get the flush working and then immediately after to make certain the toilet flushes everything away. She said that if a toilet has good pressure, it will often splash out when she flushes.
Many toliets are designed to save water so for some "jobs" it takes two flushes.
The main toilet pipe is partly plugged after where the upper pipe joins the lower one.
School prank- Putting someones head in a toilet, then flushing.
Check the flapper and re-adjust the fill height.
u dont flush the tolet
No way