That can be a 2 part answer to that question.
By looking at the picture, it actually doesn't look like you have two size capsules, it looks like some of the capsules are slightly expanded, like they aren't closed tightly - which makes perfect sense with you being overseas. The reason I say that is when capsules packed tightly and exposed to changing temperatures, like this time of year and overseas transit (or even basic transit), the capsule contents can expand. Sometimes this results in capsules coming open but most of the time it would result in what you're seeing, capsules expanding like pushing apart but stopping before they completely come open. This can happen with any product by any brand and is slightly more likely to happen with vegetarian capsules. In cases like this, one can simply take them as is or you can press them back together tighter if you choose.
The second part of that answer is that we have ran into cases with supply chain issues where for example, if a product would normally be in a size 0 veggie capsule and the supplier runs out of that size/color, we (and other brands) can be stuck with a choice of either changing color/size or running out of stock on the products. Optimize-T uses vegetarian capsules and with Veggie capsules, there are only two color options - white and clear. So, in a case like that, it makes more sense to go with a larger size white white vegetarian capsule than to go with clear ones. The only other option would be for brands to be out of stock waiting on the particular color/size to come back in stock.