It is siphoning. The end of the hose needs to be higher than the top of the water level in the reservoir it is pulling from. It is recommended in the instructions to fill the tank and not the sump for this reason. You could also have the hose trickle into a pipe of something like PVC at a higher level and have the pipe gutter it down to the sump
One thing to consider would be if the top of the sump is lower than the water level in the reservoir is when full it can still siphon, such as mine would be in my tank since I use a 13 gallon trash can which is rather tall. But is dependent on setup on whether it would
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