Jamb with a candle. - Toyota Corolla, 1.5L, 1998

While changing the direction indicators, I noticed that one high-voltage wire was not fully inserted into the candle well. Attempts to push the wire with his hands did not lead to anything.
As a result, the candle key was removed from the trunk, the candle was unscrewed and tightened again already properly.

And I thought that it was my engine that was undermining at idle speed ... They did not try at
all at the service - I myself absolutely definitely twisted everything normally when I changed the candles.

Question: why could the service touch the candles?
(in the service I changed the oil, did balancing, similarity collapse)