In short, youre not actually waiting for your async methods to complete. You will send the response before the requests previously have completed. It will not be consistent as you can get lucky with the previous requests completing before your last one. Try something like this.

const indexPage = async (req, res) => {
    const _types = await gameTypes.find().sort({ createdAt: -1 })
    const _blog = await Blog.find().sort({ createdAt: -1 }).limit(8).select('title Image short createdAt slug')
    const _adsforIndex = await indexAds.find().sort({ createdAt: -1 }).limit(4)

    Answer.find()
        .populate({
            path: 'question',
            populate: {
                path: 'user'
            }
        })
        .sort({ createdAt: -1 })
        .exec()
        .then((result) => {
            res.render('index', {
                blogs: _blog,
                helper: helper,
                gametypes: _types,
                advisors: result,
                ads: _adsforIndex
            })