MS project moving position of an activity

[atuter]

I was reviewing my schedule and i saw an activity on line 20. i wanted to move it to line 27, so i just dragged it but it surprisingly made the activity on line 28 a successor of it, although i just wanted to move the activity and do nothing else. why did it reassign relationships and how can i prevent it? i did the moving because that activity was going to take place a little later than the ones listed below it so on the bar chart it did not look so neat. so i did it to show it neat but didn’t mean to reassign any new relations

[Author]

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