First question : There is a rule about winning in the first round, you need not only to get more than 50% but also more than (?) 25% of registered voters.
I saw several candidates who got more than 50%, but all are going to the 2nd round, because of less than 50% turnout in most districts.
Just checked : 4 NUPES and one LREM elected in the first round. Historically there are many more.

Second question : The results are very uneven geographically. In the west, the most common second round will be LREM/NUPES. In the north-east and south-east, RN/Republicains is quite common.
Scroll down to the map, highlighting who came first by district.

Ah... I just saw that in the end, the Macronists just edged NUPES nationally : 25,75% against 25,66%

_{It is rightly acknowledged that people of faith have no monopoly of virtue - Queen Elizabeth II}