Problems with Time.

Hello, as the tittle says I wanted to mention the curiosities/inconsistencies in the timeline of History's strongest disciple Kenichi manga and the sequel.

- In original manga the characters still used CDs to save information; but just one year later there are smartphones.

- Honoka was stated to be a 6th grade student in one of the first chapters of manga when Kenichi was a 1st year high school student, but now Honoka is a third year middle school student while Kenichi is a third year high school student (he and Miu should be in the first year of college).

- Takeda in Eternal Sunset arc mentions that one year ago Sho said "Ichiei is Miu's father"; but in all the chapters between these events there is no mention of: Summer break (it's really long to be ignored), Kenichi's birthday, Christmas, New year celebration...

It seems Matsuena didn't really care much about the timeline, do you know or notice other curiosities like these?