Witch period for a segment

Hello,

we created a segment (27/04/2019), but when i look at the result of the visit on it, i didn’t see some result than year before, we didn’t see visits before 27/04/2018.

so if i select the same item than in the segment, for a period of 1 year (01/01_2018 to 31/12/2018), with “all the visits”, i can see some visits all the year.

the comportement of the segment is like if he couldn’t read the informations more than 1 years of the creation of the segment.

Is it normal ?

Best regards
Dan