MacBook Pro not loading although power adapter is connected
Yes - the system management controller polls the battery infrequently, so when the first plug it in, sometimes the cable has some lint or just that the battery doesn't need charge. I wouldn't worry at all and I wouldn't keep the battery always full. In my experience, that causes them to fail far more often than ones that get exhausted due to 1000 cycles (or less) and then the battery being flagged as faulty.

Apple certainly doesn't initiate a charge when the battery is nearly full, so we would need to see the detailed power status to know if you're expected to charge.

Here's what that command shows when you have a fully charged MacBook and disconnect the power and reconnect the power - no charge happens, just a back on AC power message:

me@mac ~&gt; pmset -g pslog
Logging IORegisterForSystemPower sleep/wake messages
pmset is in logging mode now. Hit ctrl-c to exit.
2019-01-26 11:03:35 -0600 IOPSNotificationCreateRunLoopSource
Now drawing from 'AC Power'
 -InternalBattery-0 (id=4194403)    100%; charged; 0:00 remaining present: true
2019-01-26 11:09:19 -0600 com.apple.system.powersources.timeremaining
2019-01-26 11:09:19 -0600 com.apple.system.powersources.percent
2019-01-26 11:09:19 -0600 IOPSNotificationCreateRunLoopSource
Now drawing from 'Battery Power'
 -InternalBattery-0 (id=4194403)    100%; discharging; (no estimate) present: true
2019-01-26 11:09:19 -0600 com.apple.system.powersources.source
2019-01-26 11:09:19 -0600 com.apple.system.powersources
2019-01-26 11:09:19 -0600 com.apple.system.powersources
2019-01-26 11:09:43 -0600 com.apple.system.powersources
2019-01-26 11:09:43 -0600 com.apple.system.powersources.timeremaining
2019-01-26 11:09:43 -0600 com.apple.system.powersources.percent
2019-01-26 11:09:43 -0600 IOPSNotificationCreateRunLoopSource
Now drawing from 'AC Power'
 -InternalBattery-0 (id=4194403)    100%; charged; 0:00 remaining present: true
2019-01-26 11:09:43 -0600 com.apple.system.powersources.source
2019-01-26 11:09:43 -0600 com.apple.system.powersources
2019-01-26 11:09:43 -0600 com.apple.system.powersources


Feel free to ask a follow on question if you want to post your power stats or have a question about system information and reporting battery health and full charge cycles. Just @ me in the comments with a link to the new question and I'll see it.