获取targetID错误

List list=JMessageClient.getConversationList();
Gson gson=new Gson();
final String content=gson.toJson(list);
以下是打印的content内容。问题：1.有部分targetId变成了科学计数，2.部分targetId不是我创建的，3.同样的代码，我是连接真机调试的，把app删除，然后再安装，获取的列表第一次为空，以后又是乱码了 4.每次获得的数量都不同

[{"a":"msg1940917752","b":"d8f7815b5759ab9742d1fbfe","e":"online1940917752","f":"","g":0,"extra":"","id":"ff79f846-61f9-4a02-96c3-86b6eaf84525","lastMsgDate":1595282991088,"latestText":"","latestType":"text","targetId":"5.92379e+09","title":"5.92379e+09","type":"single","unReadMsgCnt":0},{"a":"msg539391113","b":"d8f7815b5759ab9742d1fbfe","e":"online539391113","f":"","g":0,"extra":"","id":"b352d686-8820-4a7f-81ec-505efc9b970e","lastMsgDate":1595240306341,"latestText":"","latestType":"text","targetId":"5.91841e+09","title":"5.91841e+09","type":"single","unReadMsgCnt":0},{"a":"msg267435444","b":"d8f7815b5759ab9742d1fbfe","e":"online267435444","f":"","g":0,"extra":"","id":"cf083f3b-a8f1-4c25-a04a-563c0c7c365f","lastMsgDate":1595239719751,"latestText":"","latestType":"text","targetId":"5.91866e+09","title":"5.91866e+09","type":"single","unReadMsgCnt":0}]

补充：同样的代码，我是连接真机调试的，把app删除，然后再安装，获取的列表第一次为空，以后又是乱码了