Yes this behavior is normal.
Could be for various reasons:

• some of your peers (or peers of your peers) are connected to some users that start moving more sats around
• some of peers of your peers are having some channels drained in specific directions and then your peers will not redirect the usual routing through those but to your node (next available in the path). So you practically got their usual traffic (as being a backup path).
• you said that are not so big amounts. Then some mobile wallets were finding your node more often in their path, and the algorithm consider it a good path in that moment.

Is LN adoption growing? Definitely.
Keep your LN node healthy, hybrid and provide good fees and channels. Then everybody will be happy.

How to do that? Read my specific guides:

• https://darthcoin.substack.com/p/lightning-routing-fees-experiment
• https://darthcoin.substack.com/p/lightning-node-maintenance
• https://darthcoin.substack.com/p/recommendations-for-ln-users
• https://darthcoin.substack.com/p/bitcoin-private-banks-over-lightning