Hi, it sounds normal.
Not sure why this information isn't included in the G46VW user manual or most other models, but the English G75VW user manual p33 has some information about this as below if you want to apply it to the G46VW battery (the battery LED works differently for the G46VW model by the way).
Your battery charge will start dropping from 100% eventually and not start charging again until the charge gets below 95%.
Once the battery drops below 95%, it will keep charging until 100% as long as you keep it plugged in.
When the battery is fully charged, the system will stop charging the battery (even while plugged in) and the charge drops from 100% to below 95% before it starts charging again, so you can think of it as a 'cycle.'
Depending where you are in the charging/discharging cycle between 95-100%, the battery can be either charging or discharging while still plugged into AC power.
Hope this makes things a little more clear?