Doubling Season and Other Counters
Doubling Season allows my Planeswalkers to come in with double the counters, but when I use a +1 ability on them, I only get 1 counter instead of 2.
When I use Twitching Doll for mana, I get 1 counter instead of 2.
When I have Ozolith, the Shattered Spire, Tribute to the World Tree, Railway Brawler, and Doubling Season on the board, as I play Sunshower Druid and move its +1/+1 counter onto a different creature on the board, Sunshower Druid receives no bonus at all from any of the cards. It stays a 0/2 and receives no benefits from the other cards unless I put the +1/+1 on him.

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Honnie#18262 commented
Thank you, Rezzahan, for responding.
The problem with the Druid is he should have at least gotten +2 from Tribute and then +2 more for DS.
My issue with DS is that it specifically says counters and not +1/+1 like Ozolith specifically requires. Counters are counters, no matter which type they are. It doesn’t make sense to me that Planeswalkers get them upon arrival but not when I’m activating them. It’s just weird. All Will Be One treats them like counters and lets you do 1 damage, so I guess I just don’t see it. :o/
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Rezzahan#77802 commented
A planeswalker entering with double the loyalty counters while DS is on the field is correct, as is it not doubling the placing of loyalty counters for activating a loylaty ability. DS specifically looks for an EFFECT to place counters, COSTS don't fit the condition. Entering with counters is a replacement EFFECT, while paying a cost is not.
So, Twitching Doll should get a second counters with DS out, as I understand it.
Ozolith and DS do not place counters themselves, but rather change the number of counters placed, if one or more are being placed. Railway Brawler looks at the 0 power of the Druid, and places no counters, making those two effects not apply. That would be different, if Tribute's trigger resolved before it, as that would put either 5 or 6 counters on the Druid. The Druid's trigger can likewise put 3 or 4 counters on the targeted creature. The number of counters placed depends on the order in which Ozolith and DS are applied.
So, there seem to be some issues here, but not everything is incorrect.