If you start LO Writer with Arabic UI, the names of the default styles are given in Arabic. It seems that many of the style names have the "Al-" prefix, which is the definite article marker in Arabic. Thus, instead of styles being (some examples): نص قائمة 1 قائمة 2 Text List 1 List 2 we get: النص القائمة 1 القائمة 2 The Text The List 1 The List 2 Native speakers of Arabic may also want to chime in, but - it seems to me like the "Al-" is redundant, not to mention messing up the sorting order of styles.
This should be fix in 7.6/master